<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      height: 100vh;
      background-color: black;
      display: flex;
      flex-wrap: wrap;
    }

    div {
      width: 200px;
      height: 100px;
      background: white;
      margin: 20px;
    }

    div:nth-child(1) {
      border-top-left-radius: 100px;
      border-top-right-radius: 100px;
    }

    div:nth-child(2) {
      width: 100px;
      border-top-left-radius: 100px;
    }

    div:nth-child(3) {
      width: 50px;
      border-top-left-radius: 25px 100px;
      border-top-right-radius: 25px 100px;
    }
    div:nth-child(4) {
      width: 25px;
      border-top-left-radius: 25px 100px;
    }

    div:nth-child(5) {
      border-bottom-left-radius: 100px;
      border-top-right-radius: 100px;
    }
    div:nth-child(6) {
      border-top-left-radius: 100px;
      border-bottom-right-radius: 100px;
    }
  </style>
</head>
<body>
  <div class="box">
  </div>
  <div class="box">
  </div>
  <div class="box">
  </div>
  <div class="box">
  </div>
  <div class="box">
  </div>
  <div class="box">
  </div>
</body>
</html>